poppenhusen



' De@ 21 192e.

H. A. POPPENHUSEIIN STOKER FURNACE Filed May 51 1923 2 Sheets-Shea?. l

LMLBG H. A. POPPENHUSEN Dec. 21 1926.

sToKER FURIMCEv Filed May 51 1923 '2 Sheets-Sheet 2 Patented Dec. 2l', 1225.

@311,363 QDEFQ.

HERMAN A.. FOPENHUSEN, 0F -Alftl'OND, NDL'ANA, ASSGNOR TO GREEN ENGI- NEERING COMPANY, OF EAST CHICAGO, NDIANA, A CORPORATION OF ILLINOIS;

STOKER FURNACE.

Application filed IvIay S1,

This invention relates to furnaces equipped with mechanical stokers such as endless chain grates and provided with vertical air ducts at the sides of the grate for supplying the active grate surface with a draft delivered to the same from below and on opposite sides of the grate.

One object of my invention is to provide a construction whereby either natural or forced draft may be delivered to the grate through these duct-s and thus regulate the furnace to the kind of fuel being burned.

Another object of my invention is to provide dampers for both drafts and to oporate them simultaneously so that on opening the forced draft dampcrs the natural draft ones will be closed and vice versa.

A further object of the invention is to provide an improved form of damper operating means.

The invention consists further in the matters hereinafter described and more particularly set forth in the appended claims.

' In the accompanying drawings- Fig. 1 is a longitudinal vertical sectional view of a chain grate stolrer embodying the features of my invention;

Fig. 2 is a horizontal sectional view taken on line 2 2 of Fig. 1;

Fig. 3 is an enlarged transverse vertical sectional view taken on line 3-3 of Fig, 1;

Fig 4 is a view showing details of the lower shoe and its connection with the associated cross-member; and

Fig. 5 is a view of one of the forks and its bar, to be hereinafterI described.

In the drawings, 1 indicates a chain grate stoker having upper and lower leads 2, 3. Said grate 1 extends into the combustion chamber of the furnace through the front wall of the furnace setting and has its rear or tail end terminating short of the bridge wall 4 to provide a vertical ash discharge passage as in structures of this general kind. At the front wall is a fuel hopper 5 through which fresh or green fuel is fed on the upper lead 2 to be carried thereby in a layer for consumption, as understood in this art.

The grate 1 extends horizontally between the side walls 6, 6 of the setting, as shown in Fig. 3, and these walls each include a plurality of upright metal stools 7 7 at op- 1923. Serial No. 642,386.

posite sidesof the grate. The stools 7, 7 in each wall are laterally spaced apart, as shown in Fig. 2, and as there illustrated the furnace has six stools 7 in each side wall. rlhe stools 7 in 'one wall are aligned with those in the opposite wall, and in both the stools rest on the foundation 8 of the furnace setting.

rlhe stools 7, 7 support the side walls 6, 6 and have extending between them at their upper ends channel bars 9, 9 for this purpose, as shown in F ig. 3. Extending between the stools 7 at each side of the grate are metal shells or walls 10, 10. These are secured to the stools and form therewith a plurality of vertical air ducts 11, 11 on opposite sides of the grate. These ducts open at their upper ends into the space between the grate leads 2, 3 and at their lower ends into a main air supply passage 12, arranged in the foundation below the lower lead 3 and between the air ducts 11, as shown,

The space between the grate leads 2, 3 is divided into a plurality of compartments 13, 13 equal in number to the vertical ducts at one side of the grate and communicating with them at both sides of the grate, These compartments are made by I-beams 14, 14 extending between and secured to the stools 7, 7. The beams support skids 15 under the upper lead 2 and support the latter. Along the beams 14 are shoes 16, 17. These bear against the grate leads and provide air seals for the compartments 13. The lower lead is supported by beams 18 and skids 19. The former extend between and are secured to the stools 7. Shoes 2O bear against the under surface of the lower lead 3 at said beams. Plates 21 extend between the lower beams 18 to close the compartments from the main supply passage 12. rllhe foregoing structure is more fully described and is claimed in my co-pending application Serial No. 642,385, filed May 31, 1923.

lampers 22 control the forced draft and dampers the natural draft. The ones 22 are hinged to bars 24 supported by the stools 7. The dempers 23 co-operate with open frames 25 in the walls 10. Each pair of opposed ducts 11 has a set of four dampers, the ones 22 for forced draft from the passage 12 and the others for the frames 25 for natural draft. The dampers 23 carry frames 26 to guide them into the frames 25.

To open and close each set of dampers, I provide an endwise movable bar 27, horizontally arranged under the lower lead 3 and extending through the side plates l0, 'lO at both sides 'of the furnace. On the bar 27 at oneside of the furnace is a fixed pin QS. This projects outward on opposite sides of the bar and is arranged back of an upright forked lug 29 on the associated damper plate 22. lVhen the bar Q7 is moved endwise towardthe right as viewed in Fig. f3, the pin 28 is brought into contact with the lug 29 and the damper plate 22 swung open, as shown in said figure. Vhen moved away from the lug the damper plate closes by `gravity as shown in dotted lines in Fig. 8. To open and close the opposite damper 22 simultaneously with the one just described, a link connects said damper with the bar 23, as shown in Fig. 3.

For eachset of natural draft dampers 23, I provide the following construction. EX- tending horizontally through the stools 7.v 7 on opposite sides of the stoker are shafts 31. These are located in the air ducts ll to the rear of the associated dampers 23 and slightly below the same. Each `damper 23 is connected by an arm S2 with its shaft 3l. Said arms 32 are pivoted at their upper and lower ends te the said damp r and'shaft, re-

spectively, so that the damper maybe opened and closed by moving said arms. To do this, the arms of each damper are f actuated through the rod 27. Fixedl to saldar-ms are downwardly and inwardly extending members 33, 34, the former at one side of the grate and being in the shapeof a fork to straddle the rod27, as shown in Fig.

The member 34: at the opposite side is in the form of a link pivoted at its upper end to the associated damper arms 3Q, as shown .in Fig. 3.

The link 34: extends to the rod 27 and has its lower end between pins fixed `on said rod Q7. Said link 34- has a slot 36 on `its under side to receive the outer pin 35. This pin is thus .between the shoulders yformed 'byy the ends of said slot. The other pin 35 is the inner one and holds the outer one in said slot. At the fork 33. the rod 27 carries afixed Collar 87 having a forwardly and downwardly inclined lugr 3S. `The collar has fixed projections 39 on opposite 'sides and the lug has pins 40, as shown in Figs. 3 and 5. The fork 33 operates between these parts 39 and 40, and by them the associated dampers 23 are opened and closed on moving;r the rod 27.

For operating said rod there is a hand lever 4l at one end thereof. Said'lever 4l is at one side of the furnace in the space between two stools 7 and outside of the associated shell or wall l0. This makes the lever `accessible from the exterior of the Stoker. Said lever is mounted on a rock shaft 42 journaled in the stools 7, 7 at its side of the stoker.

Then the rod 27 is moved toward the left, the forced draft danipers 22 are closed and the natural draft ones 23 are opened. The reverse happens Awhen the rod is moved in the opposite direction. In opening the lefthand damper 23, the upper lugs 39 engage the fork 33 and push on it to open said damper. The fork 33 passes into the space between the lugs and pinsel) and comes to rest against the latter. In closing, the pins il() raise the fork, as is apparent.

ln opening the right-hand damper 23, the outer pin 925 pul nward on the link 34 and opens said dan iier. On swinging open, the link passes through the pins 35 until stopped by the upper shoulder coming to rest against the outer pin. In closing, the force is eX- erted on the link 81.1. by the outer pin lon the upper shoulder until the damper passes the center of its pivotal movement whereupon gravity moves the damper the balance of the way closed. This raises the link 34 and brings the lower shoulder against the outer pin 35 as before.

The stools make provision for the natural draft dempers 23, and thus allow them to be used with the forced draft dempers 22. This hasI the advantage of working the furnace on either forced or natural draftand thus allows regulating; the furnace to best burn the kind of fue being handled. Manifestly, it gives the stoker a wide range of fuels. For each set of opposed ducts 11, ll are natural and forced draft dampers. Each set of dampers has its operating rod Q7. These are operable independent-ly of `each other. This allows one or more of the compartments 13 to be supplied with forced draft while the others are under natural draft. The result that the supplyof draft to grate areas over the various compartn'ieuts lf3 may be regulated. This allowsladiusting` the draft over substantiallyvv the entire area of the rl"ate to meet the burningr qualities of the il ,l beingjr used.

The shoes 2O are pivoted to the members 14 as follows: Secured to each member 14 to the rear of the shoes tl erefor are brackets ef below said member, `as sown iA Fm There are two brackets 43 for each shoe and links 4A pivotally connect the 'shoes with their brackets. The'lower ends of these links extend into the sockets Llo on the shoes. To keep closed vthe space between each row `of shoes and their members 1,4, I provide plates 4:6,` onev for each shoe. Said plates llare Ahinged on the front side of their members 14 and extend to and overlap upright ribsl47 on the shoes, as shown. Thehinged conneetion'for each plate 46 is clearly `shown yin Fig. 4. There it `will be observed that the Vplatehas a. number of upright lugs48 pivotedl beleo tween ears on brackets 4-9 secured to the members 14.

While I have shown and described herein in detail a furnace structure embodying the features of my invention, it is of course to be understood that the details of construction and arrangement of parts may be variously changed and modified without departing from the spirit and scope of my invention.

I claim as my invention:

l. In a furnace, the combination with a grate, of an air duct on one side of said grate for supplying draft thereto, said duct having a natural draft opening in its wall, means for delivering forced draft to said duct, pivotally mounted dampers, one for said opening and the other for controlling the supply of forced draft to said duct, and means common to both dampers for opening one when closing the other.

2. In a furnace, the combination of a grate, air ducts on opposite sides of the grate for supplying draft thereto, a set of forced draft dampers and a set of'natural draft dampers for said ducts, and means for operating said dampers including an endwise movable rod, a link connecting one forced draft damper with said rod, a lug and a pin connecting the other forced draft damper with said rod, and a fork and a slotted link with cooperating pins respectively connecting the natural draft dampers with said rod.

3. In a furnace, the combination of an endless chain grate, having upper and lower leads, laterally spaced -upright stools on opposite sides of said grate, members extending transversely across the space between said leads and connected with the stools on opposite sides of the grate for dividing said space into a plurality of compartments, walls extending between the stools at the sides of the grate and forming with said stools air ducts opening into said compartments for supplying draft thereto, means beneath the lower lead for supplyingforced draft to said ducts, dampers for controlling the supply of forced draft to said ducts, additional dampers in said walls for supplying natural draft to said ducts, and means for actuating simultaneously the forced and natural draft dampers of each set of opposed ducts by closing one set of dampers and opening the other set.

4t. In a furnace, the combination of an endless chain grate having upper and lower leads, laterally spaced upright stools on opposite sides of said grate, members extending transversely across the space between said leads and connected with the stools on opposite sides of the grate for dividing said space into a plurality of compartments, Walls extending between the stools at the sides of the grate and forming with said stools on opposite sides of the grate air ducts opening into said compartments, means beneath the lower lead for supplying forced draft to said ducts, dampers for controlling the suply of forced draft to said chiots, additional dampers in said walls for supplying natural draft to said chiots, and means in the spaces between the stools at one side of the grate for opening and closing the forced and natural draft dampers on both sides of the grate.

5. In a furnace, the combination with a grate, of an air duct at one side of the grate for supplying draft thereto, said duct havl ing a draft opening in its Wall, a damper plate for said opening, a shaft in said duct, an arm fixed to said shaft and pivotally connected with said plate, a yoke on the shaft, an endwise movable rod passing said duct and yoke, and spaced lugs carried by said rod to receive between them the legs of the yoke for opening or closing said plate through said rod.

6. In a furnace, the combination with a grate, of an air duct at one side of the grate for supplying draft thereto, said duct having a draft opening in its wall, a damper plate for said opening, a shaft in said duct, an arm fixed to said shaft and pivotally connected with said plate, an endwise movable rod extending through said duct and having spaced lugs thereon, and a link pivoted at one end to said arm and having its other end slotted and between said lugs for opening and closing said plate through said rod.

In testimony that I claim the foregoing as my invention, I affix my signature this 28th day of May, A. D. 1923.

HERMAN A. POPPENHUSEN. 

